STIGQter: STIG Summary: Riverbed NetIM OS Security Technical Implementation Guide Version: 1 Release: 1 Benchmark Date: 11 Sep 2025:

Ubuntu OS must immediately notify the system administrator (SA) and information system security officer (ISSO) when the audit record storage volume reaches 25 percent remaining of the allocated capacity.

DISA Rule

SV-275682r1148096_rule

Vulnerability Number

V-275682

Group Title

SRG-OS-000343-GPOS-00134

Rule Version

RIIM-OS-653040

Severity

CAT III

CCI(s)

• CCI-001855 - Provide a warning to organization-defined personnel, roles, and/or locations within an organization-defined time period when allocated audit log storage volume reaches an organization-defined percentage of repository maximum audit log storage capacity.

Weight

10

Fix Recommendation

Configure Ubuntu OS to notify the SA and ISSO when the audit record storage volume reaches 25 percent remaining of the allocated capacity.

Add or modify the following lines in the "/etc/audit/auditd.conf " file:

space_left = 25%
space_left_action = email

Restart the "auditd" service for the changes to take effect:

$ sudo systemctl restart auditd.service

Note: If the "space_left_action" parameter is set to "exec", ensure the command being executed notifies the SA and ISSO.

Check Contents

Verify Ubuntu OS is configured to notify the SA and ISSO when the audit record storage volume reaches 25 percent remaining of the allocated capacity by using the following command:

$ sudo grep -i space_left /etc/audit/auditd.conf
space_left = 25%
space_left_action = email

If "space_left" is set to a value less than "25%", is commented out, or is missing, this is a finding.

If "space_left_action" is not set to "email", is commented out, or is missing, this is a finding.

Note: If the "space_left_action" is set to "exec", the system executes a designated script. If this script informs the SA of the event, this is not a finding.

Vulnerability Number

V-275682

Documentable

False

Rule Version

RIIM-OS-653040

Severity Override Guidance

Verify Ubuntu OS is configured to notify the SA and ISSO when the audit record storage volume reaches 25 percent remaining of the allocated capacity by using the following command:

$ sudo grep -i space_left /etc/audit/auditd.conf
space_left = 25%
space_left_action = email

If "space_left" is set to a value less than "25%", is commented out, or is missing, this is a finding.

If "space_left_action" is not set to "email", is commented out, or is missing, this is a finding.

Note: If the "space_left_action" is set to "exec", the system executes a designated script. If this script informs the SA of the event, this is not a finding.

Check Content Reference

M

Target Key

5706